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Question: in the figures at the right are shown two systems...

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In the figures at the right are shown two systems: a cart moving back and forth on a spring and a swinging pendulum. The graph below can be used to show the back and forth displacement of both systems as a function of time as long as the pendulum is kept at a small angle.

Three instants of time are marked on the graph: A, B, and C.
lx(m) r (m 一-0.5 1.5 2.5 3.5 4 t (s B ▲IC
O50f1.jpg
O50f2.jpg

A. Specify the directions of the quantities below for the cart by choosing one of the following symbols: L (Left), R (Right), U (Up), D (Down), 0 (Zero), or S (Some other direction).
vcart(at A):  ---Select--- L R U D 0 S
vcart(at C):  ---Select--- L R U D 0 S
acart(at B):  ---Select--- L R U D 0 S
Fnetcart(at B):  ---Select--- L R U D 0 S

B. Specify the directions of the quantities below for the pendulum by choosing one of the following symbols: L (Left), R (Right), U (Up), D (Down), 0 (Zero), or S (Some other direction).
vpendulum(at A):  ---Select--- L R U D 0 S
vpendulum(at C):  ---Select--- L R U D 0 S
apendulum(at B):  ---Select--- L R U D 0 S
Fnetpendulum(at B):  ---Select--- L R U D 0 S

C. If you knew m, could you calculate the length of the pendulum, L? If yes, explain how. If no, explain why not.
---Select--- You can You can't

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